Transformer.



J. M. WEED.

TRANSFORMER.

APPLICATION FILED AUGJ, 1912.

Patented Feb. 1, 1916.

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TRANSFORMER.

APPLICATION FILED AUGJ. 1912.

1,170,201 Patented Feb. 1, 1916.

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UNITED STATES PATENT OFFICE.

JAMES M. WEED, OF

PITTSFIEID, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

TRANSFORMER.

Specification of Letters Patent.

Application filed Airgun 1, 1912." Serial no. 713,845.

' citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Transformers, of whichthe following is a specification.

My invention relates to transformers. Its

objects are the improvement of the ventilation and mechanical strength of trans-v formers and the production of a novel means for handling a transformer and holding it in its place in its tank. In order to accomplish the first of these objects, I build the core of the transformer in a plurality of sections of novel construction and. combine these core sections together in a novel manner to form the complete core. The peculiar construction of the core allows the use therewith of a novel and desirable means for holding the whole transformer in position.

Thesections comprising the core are provided with curved inner and outer surfaces on the center legs. By assembling these sections so that the centralmost of the corresponding edges of the various sections are displaced from each other, I produce a core having ventilating spaces extending from the bottom to the top near its center. The most central space or opening may be of sufficient size to contain the rod of the holding means later described. By reason of the curved inner surfaces on the center leg's, the inner coil may be drawn tightly against these surfaces without subjecting the insulation of the coil to the undue strains of sharp bends during winding. Such a relation of coil and core obviously tends to produce a mechanically strong transformer. i s

The novelholding and carrying means in general consists of a rod extending through the center of the transformer having attached to it two clamping members for engaging the ends of the transformer core.v

This rod provides a simple means for handling the transformer and for attaching it to the tank.

The drawings which form a part of this specification illustrate a transformer involving my invention.

Figure 1 is a sectional view through the casing looking downward on the top of the transformer; Figs. 2 and 3 illustrate in perspective two possible dispositions of the laminae of the various sections; Fig. 4 is a vertical section on the line wa.' (omittingfor clearness the corner of one core section) showlng particularly the means I employ for holding the entire transformer in its place in the casinggand Fig. 5 is a sectional View of a part of a core showing a modification.

The core of the transformer illustrated is composed of a plurality of sections. The outer and inner surfaces (1. and b of the inner leg' of each core section I desire to have cu-r'ved or at least depart from single planes;

the surface I) should conform preferably to the arc of a circle having the center of the transformer as a center. By preference I construct each sectlon of the transformer core of laminae initially of uniform width of the shapes shown in Figs. 2 and 3. It will be seen that the laminae are of two general shapes, an L-shape, 1, and'a rectangular shape, 2, the corners being cut off according to the prevailing practice. I construct the sections in general of the L-shaped laminae. These laminations 1 are fanned away from the first lamina or laminae at one side by inserting the laminae 2 in suitable numbers in the outer leg of each core section as shown in Fig. 1. The individual laminae are thus disposed along approximately radial lines relative to the transformer coils, as will also be seen in this figure. The laminae withrespect to the joints may be related in various ways. Two desirable arrangements are shown in Figs. 2 and 3. The L-shaped laminae 1 are placed with two joints together and the next two joints oflset. Inserted laminae 2 may then be placed as shown in Fig. 2 between adjacent laminae having offset joints, or as shown in Fig. 3 between laminae having adjacent joints. The insertion of the laminae 2 and the fanning caused thereby, it will be seen, produces as many ventilating spaces 3 in the cross members as there are laminae 2. The laminae 1 are offset relatively longitudinally to produce the curved surfaces on the inner and outer legs of the core sections as shown in The entire core of the transformer illustrated is-composed of three core sections constructed as above described. When the sections are put together to form the entire core the edges of the center legs are offset or displaced from each other, as shown inFig.

Patented Feb. 1,1916.

4 and the spaces 5 and 6. Eachof the" most may be secured by making the central correspondingyside edges. of the center legs is displaced along an outer surface ofanother leg. Through these openings the cooling fluid readily passes and by them the ventilationof'the entire structure is aided. It will be apparent from an; inspection of Fig. 1 that the inner surfaces 1) of the center legs of the sections are designed to be approximately arcs ofthe same circle, and hence coils without sharp bends may be used. This allows a more solid mechanical construction and the insulation of the coils is not subjected to as heavy strains during winding as is common in other forms of construction where sharp bends occur. In the particular construction shown, each winding is made up oftwo coils 8, 8' and 9, 9- which may be wound directly on the core. I These coils may be spaced relatively by the usual space blocks 10 as shown in the drawing and as has heretofore been common; liberal ventilatin spaces are thus provided therebetween. pace blocks 11 are advantageously used to help hold the core sections and the l aminationsthereof in place.

It will be understood that while the outer and inner surface a and b of the inner legs have been described as curved, that the element of these surfaces-is not a perfect curve. Since these surfaces are produced by offsetting the laminae of each section relative to each other, the surfaces are of .necessity composed of a plurality of plane surfaces. The surfaces of the edges of the laminae are offset *from each other. My invention is not limited to the offsetting of each lamina relative to its adjacent laminae as it is obvious that certain advantages of my invention curved surfaces of a plurality of plane surfaces where each plane surface is of a more appreciable width, although this may be at the sacrifice of area of ventilating space. Fig. 5 illustrates a construction where the surfaces at and b on the inner legs are each made up of a plurality of plane surfaces. By the term departing from a single plane, etc., in the claims, all such constructions are obviously included. 'It will be noticed that in the construction illustrated in Fig. 5 there are no ventilating spaces corresponding to the ventilating spaces 5, 6 and 7 of Fig. 1,.

these ventilating spaces having been sacrificed in this case.

With this construction of the transformer a novel means of holding the same in place ing members 14 and 15 may be attached inv any desirable way to this rod. I prefer to make the attachment a screw threaded one in maintainingthe transformer in position.

To further aid in maintaining the transformer in position, I have provided projections 17 on the lower clamping member 15. These projections rest in depressions in the base of the tank.

The rod 12 may be held stationary rela- I tive'to the tank in any desired/way I find it convenient and satisfactory to provide sockets 18 and 19 in the top and bottom members of the tank respectively to receive the ends of the rod. Gaskets 20 maybe provided betweenthe end of the rod and the tank. With this construction the transformer may be assembled and held on the rod 12 by means of the clamping members 14 and 15. The whole may then be handled readily and placed within the tank; when the cover of the tank is attached in position, it is apparent that the transformer is firmly held in place.

What I claim as'new and desire to secure by Letters Patent of the United States, is, 1. A transformer core section composed of laminations of substantially the same size, offset relatively longitudinally to produce surfaces on the legs each departing I from a single plane, and additional laminations inserted in one leg between the other laminations, the laminations on one side of the core section being unchanged in shape and the remaining laminations being gradually bent or fanned away from this side to make .room for the additional laminations 2. The combination of a plurality of core sections forming a transformer core, each including a center leg the outer surface of whlch departs from a single plane, the sectlons being symmetrically grouped with the center legs together, one edge of the outer surface of the center leg of each section being located nearer the center of the core than the other and being displaced from the corresponding edges of the other sections, along the outer surface of another center leg.

3. A transformer core comprising three sections, each section including a center leg and being composed of laminations initially of uniform width ofi'set relatively lonfitm e of dinally and fanned away from one si the section, the sections being assembled with the center legs of the sections at the center of the core and with one edge of the outer surface of the center leg of each sec-- tion nearer the center of the core than the other and displaced from the corresponding edges of the other sections.

4. The combination of a transformer having a laminated core providing a complete magnetic circuit, a rod extending through the transformer core at approximately its center, core clamping plates carried by said rod engaging and supporting the core at its opposite ends and clamping its parts together, and a tank for the transformer pro vided with means for supporting the rod by engaging its ends.

5. The combination of a transformer having a laminated core providing a complete magnetic circuit, a rod extending through the transformer at approximately its center, core clamping plates carried by said rod and engaging and supporting the core at its opposite ends and clamping its parts together, and a tank for the transformerprovided with means for supporting the rod by engaging its ends, the walls of the tank engaging one of the clamping plates.

In Witness whereof, I have hereunto set my hand this 5th day of Aug, 1912.

JAMES M. WEED. Witnesses:

A. K. UNGENT, C. S. Mares. 

